Personally, I would not put a lot of faith in the seller. Mostly because he claims some of the router bits are worth $150 each. I just did some googling, to find the most expensive router bit I could find. Found this. https://www.woodpeck.com/whiteside4pcroundover.html
But it is not A bit, it is a set of four Whiteside roundover bits, for $110 and change. And Whiteside is not low quality. I haven't priced them for years, but Harbor Freight used to carry factory refurbished routers, Delta and DeWalt I believe, but I didn't need one, so paid little attention. Don't know if they still carry them, but that is an option, and they have a great return policy. I have bought a few things of off eBay, for very reasonable prices, and they worked; but if they don't work, gettin a refund can be a hassle. Another option. Then there are pawn shops - problem I have found with them is they are usually more than I feel whatever is worth, not always, but often enough to deter. Then there's craigslist - an advantage there is the stuff is usually close enough to you to go and actually see whatever before you buy, and often you can talk the seller down, or even work a trade.
Maybe you have friends with routers, that will let you borrow one, or play with one, to get sort of a feel of what you want/need. Nothing wrong with buying a cheap router to start, and upgrade when you can, or if it dies. Oh yes, perhaps you know someone close to where the guy selling the router and bits is, and can check them out in person for you, and tell you what he thinks.
Best I can come up with.
"It ain't what you're told, it's what you know." - Granny Weatherwax
Fawkahwe tribal police SWAT Team
Some days, the supply of available curse words is insufficient to meet my demands.
.....Call me a craftsman, artisan, or artistic, and I will accept that. Call me an artist and you will likely get a quite rude comment in return. I am not a @#$%ing artist.